collision.cpp

   1 #include "collision.h"
   2
   3 void CollisionManager::subscribe(Thing* thing){
   4         things.insert(thing);
   5 }
   6
   7 void CollisionManager::remove(Thing* thing){
   8         things.erase(thing);
   9 }
  10
  11 void CollisionManager::update(){
  12         std::set<Thing*>::iterator it1,it2;
  13         for (it1 = things.begin(); it1 != things.end(); it1++) {
  14                 for (it2 = it1; it2 != things.end(); it2++) {
  15                         if (*it1 == *it2) continue;
  16                         checkCollision(*it1,*it2);
  17                 }
  18         }
  19 }
  20
  21 bool pointInsidePolygon(Ponto ponto, Polygon p) {
  22         std::vector<Linha>::iterator it;
  23         Ponto infinito(0xffffff,ponto.y);
  24         int inter = 0;
  25         Linha toinfinity(ponto,infinito);
  26         for (it = p.linhas.begin(); it != p.linhas.end(); it++) {
  27                 if (linesIntersect(*it,toinfinity)) {
  28                         inter++;
  29                 }
  30         }
  31         if (inter % 2 == 1)
  32                 return true;
  33         else
  34                 return false;
  35 }
  36
  37 bool CollisionManager::checkCollision(Thing* a, Thing* b){
  38         if (a->dead || b->dead)
  39                 return false;
  40         Polygon pa,pb;
  41         pa = a->getCollision();
  42         pb = b->getCollision();
  43         pa.translate(a->getPosition());
  44         pb.translate(b->getPosition());
  45         std::vector<Linha>::iterator ita,itb;
  46         if (pointInsidePolygon(pb.linhas[0].vertices[0],pa)) {
  47                 a->collide(b);
  48                 b->collide(a);
  49                 return true;
  50         }
  51         for (ita = pa.linhas.begin(); ita != pa.linhas.end(); ita++) {
  52                 for (itb = pb.linhas.begin(); itb != pb.linhas.end(); itb++) {
  53                         /*std::cout<<"A:"<<(*ita).vertices[0].x<<" "<<(*ita).vertices[0].y<<" "
  54                                          <<(*ita).vertices[1].x<<" "<<(*ita).vertices[1].y<<std::endl;
  55                         std::cout<<"B:"<<(*itb).vertices[0].x<<" "<<(*itb).vertices[0].y<<" "
  56                                          <<(*itb).vertices[1].x<<" "<<(*itb).vertices[1].y<<std::endl;*/
  57                         if (linesIntersect(*ita,*itb)) {
  58                                 a->collide(b);
  59                                 b->collide(a);
  60                                 return true;
  61                         }
  62                 }
  63         }
  64         return false;
  65 }